Hotplug (qemu disk,nic,cpu,memory): Difference between revisions

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and add
and add
<pre>
<pre>
cores: 1
cores: 2
maxcpus: 16
sockets: 2
vcpus: 1
</pre>
</pre>


You will start your vm with 1 cpu|cores, and you can hotplug later up to 16 cores.
You will start your vm with 1 cpu|cores, and you can hotplug later up to 4 cores.
maxcpus = sockets * cores.


Simply use the gui as usual to add cpus.
To hotplug a new vcpu (GUI not yet available in proxmox 3.4).


Note: you can't hotplug sockets with multiple cores, so don't define socket option.
#qm set VMID -vcpus 3
 
This will hotplug 2 new vcpus, for a total of 3vcpus.


== Memory hotplug ==
== Memory hotplug ==

Revision as of 07:23, 20 February 2015

Proxmox support hotplugging of qemu devices

- disks (hotplug/unplug)

- nics (hotplug/unplug)

- cpu (core hotplug only)

- memory (hotplug only - not yet released)

Linux Guests notes

kernel modules needed

you need to have 2 modules loaded in your linux guest

#modprobe acpiphp
#modprobe pci_hotplug

cpu && memory hotplug

you need a recent kernel > 3.10

and a udev rules, to auto enable cpus or memory hotplugged

you can add a file:


/lib/udev/rules.d/80-hotplug-cpu-mem.rules

SUBSYSTEM=="cpu", ACTION=="add", TEST=="online", ATTR{online}=="0", ATTR{online}="1"
SUBSYSTEM=="memory", ACTION=="add", TEST=="state", ATTR{state}=="offline", ATTR{state}="online"

Windows Guests notes

- Disk and nic hotplug is working out of the box for all windows versions >2003 - cpu && memory hotplug is working on > 2008 enterprise/datacenter, 2012 > standard


Disk && Nic hotplug/unplug

edit your vm configuration file

/etc/pve/qemuserver/<VMID>.conf

and add

hotplug: network,usb,memory,disk,cpu

Note: Since proxmox 3.3, hotplug option is available in GUI.


Then add/remove your disk or nics as usual.

For disk unplug, verify that your disk is not mounted in your linux guest or disabled in windows disk management.

CPU hotplug

/etc/pve/qemuserver/<VMID>.conf

and add

cores: 2
sockets: 2
vcpus: 1

You will start your vm with 1 cpu|cores, and you can hotplug later up to 4 cores. maxcpus = sockets * cores.

To hotplug a new vcpu (GUI not yet available in proxmox 3.4).

  1. qm set VMID -vcpus 3

This will hotplug 2 new vcpus, for a total of 3vcpus.

Memory hotplug

Need to be done